private static IEnumerable <SpotifyPlaylistTrack> GetPlaylistTracks(AuthenticationObject authObj, SpotifyPlaylist playlist)
        {
            var playlistTracks = new List <SpotifyPlaylistTrack>();

            using (HttpClient client = new HttpClient())
            {
                client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", authObj.access_token);

                var response = client.GetAsync($"{playlist.tracks.href}").Result;

                var responseContent = response.Content.ReadAsStringAsync().Result;

                var jobj = JObject.Parse(responseContent);
                playlistTracks = JsonConvert.DeserializeObject <List <SpotifyPlaylistTrack> >(jobj["items"].ToString());
            }
            return(playlistTracks);
        }